Q.6 If, x+y=6, y+z=7, z+x=9. Find the arithmetic mean of x, y, and z.
A. 14/9
B. 11/3
C. 13/5
D. 15/4
Correct Answer) B: 11/3
Description:
Solution:
x+y + y+z + z+x = 6 + 7 + 9
2x + 2y + 2z = 22
2(x + y + z) = 22
x + y + z = 22/2
x + y + z = 11
to calculate arithmetic mean:
x + y + z / 3 = 11 / 3 Ans.
Q.7 The two numbers whose sum is-13 and the product is -30 are:
Therefore, 5448 rounded off the nearest 1000 is 5000.
Q.12 Naveed got an average of 50 in 6 test. What should he get in the next test to attain the average of 60?
A. 120
B. 140
C. 125
D. 135
Correct Answer) A: 120
Description:
Total Marks in 6 test= 50 x 6= 300.
Total Marks required in 7 tests = 60 x 7 = 420, So the marks in 7th test will be:
420 - 300 = 120 Ans.
Q.13 What number increased by 20% of itself is equal to 102?
A. 85
B. 75
C. 90
D. 65
Correct Answer) A: 85
Description:
Solution:
x + 20/100*x = 102
x + 1/5 *x = 102
5x + x/5 = 102
6/5*x = 102
6x = 102*5
6x = 510
x = 510/6
x = 85 Ans.
Q.14 When 4 dice are thrown, what is the probability that the same number appears on each of them?
A. 1/216
B. 3/417
C. 2/445
D. 4/523
Correct Answer) A: 1/216
Description:
Solution:
Sample space = 6x6x6x6 =1296
Possible outcomes = 6
Probability = 6/1296
= 1/216 Ans.
Q.15 A histogram is a set of adjacent:
A. rectangles
B. circles
C. triangles
D. squares
Correct Answer) A: rectangles
Description:
A histogram is an approximate representation of the distribution of numerical data. It was first introduced by Karl Pearson. To construct a histogram, the first step is to "bin" (or "bucket") the range of values—that is, divide the entire range of values into a series of intervals—and then count how many values fall into each interval. The bins are usually specified as consecutive, non-overlapping intervals of a variable. The bins (intervals) must be adjacent and are often (but not required to be) of equal size.
Q.16 Simple interest on Rs.400\- in 3 years @ 5%per annum is:
A. 65
B. 60
C. 55
D. 50
Correct Answer) B: 60
Description:
400*5/100 = 20
For 3 years:
3*20 = 60 Ans.
Q.17 Zahid purchased 20 dozen of toys at the rate of Rs. 375 per dozen. He sold each toy for Rs. 33. What was his percentage of profit?
A. 7.2 %
B. 5.6 %
C. 4.8 %
D. 8.5 %
Correct Answer) B: 5.6 %
Description:
Solution: Price of 1 dozen = 375
Price of 1 toy = 375/12, which is 31.25
So, Cost Price = 31.25
Sales Price = 33
Profit = S.P – C.P
= 33 – 31.25
= 1.75
To calculate profit%, formula
Profit% = Profit/C.P * 100
Profit% = 1.75/3125*100
Profit% = 5.6%
A histogram is an approximate representation of the distribution of numerical data. It was first introduced by Karl Pearson. To construct a histogram, the first step is to "bin" (or "bucket") the range of values—that is, divide the entire range of values into a series of intervals—and then count how many values fall into each interval. The bins are usually specified as consecutive, non-overlapping intervals of a variable. The bins (intervals) must be adjacent and are often (but not required to be) of equal size.
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